"Hadoop: The Definitive Guide, Third Edition is not a beginners how-to book. But its definitely recommended for programmers looking to analyze datasets of any size, and for administrators who want to set up and run Hadoop clusters."
-- Si Dunn, Sagecreek Productions

"The book is a good reference, capturing new developments of Hadoop and its ecosystem of projects sufficiently across its breadth."
-- Mitch Pronschinske, DZone.com

"If you happen to start working with Hadoop in your project or considering some of the related technologies--this book is a great start."
-- Paris Apostolopoulos, Papo's log

"It's a solid all around book covering several different areas of the Hadoop ecosystem. However, it shouldn't be the first book someone reads about Hadoop."
-- Alexandros Giamas, Athens MongoDB User Group